Add mock classes for Bus, ObjectProxy, and ExportedObject.

Also add mock_unittest.cc that demonstrates how to mock synchronos and
asynchronos D-Bus method calls.

BUG=90036
TEST=dbus_unittests

Review URL: http://codereview.chromium.org/7714030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98188 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 171 insertions, 0 deletions

diff --git a/dbus/mock_unittest.cc b/dbus/mock_unittest.cc
new file mode 100644
index 0000000..f0289cf
--- /dev/null
+++ b/dbus/mock_unittest.cc
@@ -0,0 +1,171 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "dbus/message.h"
+#include "dbus/mock_bus.h"
+#include "dbus/mock_object_proxy.h"
+#include "dbus/mock_exported_object.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::Return;
+using ::testing::Unused;
+
+class MockTest : public testing::Test {
+ public:
+  MockTest() {
+  }
+
+  void SetUp() {
+    // Create a mock bus.
+    dbus::Bus::Options options;
+    options.bus_type = dbus::Bus::SYSTEM;
+    mock_bus_ = new dbus::MockBus(options);
+
+    // Create a mock proxy.
+    mock_proxy_ = new dbus::MockObjectProxy(mock_bus_.get(),
+                                            "org.chromium.TestService",
+                                            "/org/chromium/TestObject");
+
+    // Set an expectation so mock_proxy's CallMethodAndBlock() will use
+    // CreateMockProxyResponse() to return responses.
+    EXPECT_CALL(*mock_proxy_, CallMethodAndBlock(_, _))
+        .WillRepeatedly(Invoke(this, &MockTest::CreateMockProxyResponse));
+
+    // Set an expectation so mock_proxy's CallMethod() will use
+    // HandleMockProxyResponseWithMessageLoop() to return responses.
+    EXPECT_CALL(*mock_proxy_, CallMethod(_, _, _))
+        .WillRepeatedly(
+            Invoke(this,
+                   &MockTest::HandleMockProxyResponseWithMessageLoop));
+
+    // Set an expectation so mock_bus's GetObjectProxy() for the given
+    // service name and the object path will return mock_proxy_.
+    EXPECT_CALL(*mock_bus_, GetObjectProxy("org.chromium.TestService",
+                                          "/org/chromium/TestObject"))
+        .WillOnce(Return(mock_proxy_.get()));
+  }
+
+  // Called when the response is received.
+  void OnResponse(dbus::Response* response) {
+    // |response| will be deleted on exit of the function. Copy the
+    // payload to |response_string_|.
+    if (response) {
+      dbus::MessageReader reader(response);
+      ASSERT_TRUE(reader.PopString(&response_string_));
+    }
+    message_loop_.Quit();
+  };
+
+ protected:
+  std::string response_string_;
+  MessageLoop message_loop_;
+  scoped_refptr<dbus::MockBus> mock_bus_;
+  scoped_refptr<dbus::MockObjectProxy> mock_proxy_;
+
+ private:
+  // Returns a response for the given method call. Used to implement
+  // CallMethodAndBlock() for |mock_proxy_|.
+  dbus::Response* CreateMockProxyResponse(dbus::MethodCall* method_call,
+                                          int timeout_ms) {
+    if (method_call->GetInterface() == "org.chromium.TestInterface" &&
+        method_call->GetMember() == "Echo") {
+      dbus::MessageReader reader(method_call);
+      std::string text_message;
+      if (reader.PopString(&text_message)) {
+        dbus::Response* response = dbus::Response::CreateEmpty();
+        dbus::MessageWriter writer(response);
+        writer.AppendString(text_message);
+        return response;
+      }
+    }
+
+    LOG(ERROR) << "Unexpected method call: " << method_call->ToString();
+    return NULL;
+  }
+
+  // Creates a response and runs the given response callback in the
+  // message loop with the response. Used to implement for |mock_proxy_|.
+  void HandleMockProxyResponseWithMessageLoop(
+      dbus::MethodCall* method_call,
+      int timeout_ms,
+      dbus::ObjectProxy::ResponseCallback response_callback) {
+    dbus::Response* response = CreateMockProxyResponse(method_call,
+                                                       timeout_ms);
+    message_loop_.PostTask(FROM_HERE,
+                           base::Bind(&MockTest::RunResponseCallback,
+                                      base::Unretained(this),
+                                      response_callback,
+                                      response));
+  }
+
+  // Runs the given response callback with the given response.
+  void RunResponseCallback(
+      dbus::ObjectProxy::ResponseCallback response_callback,
+      dbus::Response* response) {
+    response_callback.Run(response);
+    delete response;
+  }
+};
+
+// This test demonstrates how to mock a synchronos method call using the
+// mock classes.
+TEST_F(MockTest, CallMethodAndBlock) {
+  const char kHello[] = "Hello";
+  // Get an object proxy from the mock bus.
+  dbus::ObjectProxy* proxy = mock_bus_->GetObjectProxy(
+      "org.chromium.TestService",
+      "/org/chromium/TestObject");
+
+  // Create a method call.
+  dbus::MethodCall method_call("org.chromium.TestInterface", "Echo");
+  dbus::MessageWriter writer(&method_call);
+  writer.AppendString(kHello);
+
+  // Call the method.
+  scoped_ptr<dbus::Response> response(
+      proxy->CallMethodAndBlock(&method_call,
+                                dbus::ObjectProxy::TIMEOUT_USE_DEFAULT));
+
+  // Check the response.
+  ASSERT_TRUE(response.get());
+  dbus::MessageReader reader(response.get());
+  std::string text_message;
+  ASSERT_TRUE(reader.PopString(&text_message));
+  // The text message should be echo'ed back.
+  EXPECT_EQ(kHello, text_message);
+}
+
+// This test demonstrates how to mock an asynchronos method call using the
+// mock classes.
+TEST_F(MockTest, CallMethod) {
+  const char kHello[] = "hello";
+
+  // Get an object proxy from the mock bus.
+  dbus::ObjectProxy* proxy = mock_bus_->GetObjectProxy(
+      "org.chromium.TestService",
+      "/org/chromium/TestObject");
+
+  // Create a method call.
+  dbus::MethodCall method_call("org.chromium.TestInterface", "Echo");
+  dbus::MessageWriter writer(&method_call);
+  writer.AppendString(kHello);
+
+  // Call the method.
+  proxy->CallMethod(&method_call,
+                    dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+                    base::Bind(&MockTest::OnResponse,
+                               base::Unretained(this)));
+  // Run the message loop to let OnResponse be called.
+  message_loop_.Run();
+
+  EXPECT_EQ(kHello, response_string_);
+}